Storefront API credentials not showing

Hi,

I’m trying to get the API credentials so I can test setting up prefilled checkouts.

I’ve created and installed my custom app, but when I go Admin > Settings > Apps & Sales Channels > {My App}, there is nothing there showing API credentials. I reached out to shopify support but they were unable to help and recommend I posted here.

If anyone has any experience or advice it would be greatly appreciated.

Thanks